There are a variety of organisations that offer riser recliner chairs for hire. Although we can't vouch for specific ones, if you have a look on a search engine there are various options available.
I'm not sure if you are also looking for financial support or similar for this; if so, you may find it helpful to give Macmillan a call. They also have information about equipment and home adaptations.
Otherwise, if others here have advice or recommendations to offer then hopefully you'll get some more replies to your post here soon.
